A self-locking mechanism for injection molds used for large-area thin-walled composite inserts

Abstract

The present invention proposes a self-locking mechanism for an injection mold for composite inserts of large-area thin-walled parts, wherein the insert fixing pin includes a pin body and a sleeve assembly, the pin body includes an insert mounting portion; the sleeve assembly includes a deformable end, the driving structure includes a J-shaped guide column and a slider, and the insert tightness control structure includes a driving tapered needle. When the mold is closed, the deformable end deforms outward, so that the force between the deformable end and the insert is increased, thereby reducing the movement of the insert under high pressure during injection molding, thereby improving the quality of the injection molded product and reducing the defective rate; when the mold is opened, the deformable end resets inward, so that the force between the deformable end and the insert is reduced, thereby making it easy to demold the injection-molded product and improving the success rate of placing a new insert on the insert mounting portion; and, due to the provision of the deformable end, the fitting clearance between the insert mounting portion and the insert can be designed to be larger, so that the insert can be placed manually or by a robot when the mold is opened, further improving the success rate of insert placement.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, and in particular to a self-locking mechanism of an injection mold for composite inserts of large-area thin-walled parts. Background Art

[0002] When producing injection molded products with inserts, especially large-area, thin-walled composite insert injection molded products, it is usually necessary to set the insert in the cavity of the injection mold in advance, and then press the molten injection molding material into the cavity. This can fix the insert in the designated position of the plastic product while molding the plastic product.

[0003] During actual production, inserts are grabbed manually or by a robot and placed on the insert fixing pins in the cavity of the injection mold. Since the molten injection molding material is pressed into the cavity with a high pressure, the insert is prone to jumping on the insert fixing pins, resulting in the insert failing to be compounded in the designated position of the large-area thin-walled injection molding product, thereby affecting the quality and defective rate of the injection molding product. In order to reduce the jumping, technicians design the fitting clearance between the insert and the insert fixing pin to be smaller, so as to increase the friction between the insert and the insert fixing pin, thereby improving the jumping of the insert. However, the larger friction will lead to a lower success rate of placing the insert on the insert fixing pin, which will also affect the quality and defective rate of the large-area thin-walled injection molding product. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide an injection mold self-locking mechanism for large-area thin-walled composite inserts, which can reduce the movement of inserts and facilitate the placement of inserts during the production of injection molded products, as well as an injection mold with the above-mentioned self-locking mechanism.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: a self-locking mechanism for an injection mold for a large-area thin-walled composite insert, comprising an insert fixing pin, a driving structure provided on one side of the insert fixing pin, and an insert tension control structure provided on one end of the insert fixing pin and driven by the driving structure;

[0006] The insert fixing pin includes a pin body and a sleeve assembly disposed in the pin body; the pin body includes an insert mounting portion disposed at one end and used to place the insert, and the sleeve assembly includes a deformable end that cooperates with the insert mounting portion;

[0007] The drive structure includes a J-shaped guide post and a slider; the J-shaped guide post and the slider move up and down relative to each other as the mold is opened or closed, and the slider is driven by the J-shaped guide post to move left and right; the insert tension control structure includes a driving tapered needle that is driven by the left and right movement of the slider to move up and down within the sleeve assembly;

[0008] During injection molding, the driving tapered needle moves upward and the deformable end deforms outward to increase the force acting on the insert; when placing the insert, the driving tapered needle moves downward and the deformable end resets inward to reduce the force acting on the insert.

[0009] Compared with the prior art, the insert fixing pin of the present invention comprises a pin body and a sleeve assembly, the pin body comprises an insert mounting portion for placing the insert and setting the insert in the mold cavity; the sleeve assembly comprises a deformable end, the driving structure comprises a J-shaped guide column and a slider, and the insert tightness control structure comprises a driving tapered needle. When the mold is closed, the J-shaped guide column drives the slider and the driving tapered needle to move, thereby driving the deformable end to deform outward, so that the force between the deformable end and the insert is increased, thereby reducing the jump of the insert under the high pressure during injection molding, thereby improving the injection molding yield. When the mold is opened, the J-shaped guide column drives the slider and the tapered needle to move, thereby driving the deformable end to reset inward, so that the force between the deformable end and the insert is reduced, thereby making it easy to demold the finished product and increasing the success rate of placing the new insert in the insert installation part, thereby further improving the quality of the injection molded product and reducing the defective rate; and, due to the provision of the deformable end, the fitting clearance between the insert installation part and the insert can be designed to be larger, so that the insert can be placed manually or by a robot when the mold is opened, further improving the success rate of insert placement.

[0010] The present invention provides a self-locking mechanism for an injection mold for a composite insert of a large-area thin-walled part, wherein the deformable end includes at least one deformable piece, and the insert mounting portion includes at least one empty slot that cooperates with the deformable piece; the driving taper needle includes a needle rod and a needle head arranged at the end of the needle rod; when the needle head cooperates with the deformable piece, the deformable piece is hidden in the insert mounting portion through the empty slot; when the needle rod cooperates with the deformable piece, the deformable piece protrudes from the insert mounting portion through the empty slot.

[0011] The present invention provides a self-locking mechanism for an injection mold for a large-area thin-walled composite insert, wherein the deformable piece is provided with a plurality of locking parts on a side facing the empty slot; the locking parts are used to increase the force between the deformable end and the insert.

[0012] The present invention provides a self-locking mechanism for an injection mold for composite inserts of large-area thin-walled parts, wherein the interior of the pin body has a first hole segment, a second hole segment and a third hole segment; the sleeve assembly includes a sleeve body and at least one connecting strip nested by the sleeve body; the connecting strip includes a limit block and a transition strip; the limit block cooperates with the first hole segment; the sleeve body cooperates with the second hole segment; the transition strip passes through the sleeve body and cooperates with the third hole segment; the deformable end is arranged at the end of the transition strip.

[0013] The present invention provides a self-locking mechanism for an injection mold for composite inserts of large-area thin-walled parts, wherein the sleeve body has an intermediate channel arranged inside, at least one first embedding groove arranged below the side wall, and at least one second embedding groove arranged above the side wall; the intermediate channel is used for the movement of the needle rod; the first embedding groove cooperates with the limit block; and the second embedding groove cooperates with the transition strip.

[0014] The present invention provides a self-locking mechanism for an injection mold for a large-area thin-walled composite insert, wherein the J-shaped guide column includes a compensation block, a connecting block arranged at one end of the compensation block, and an inclined guide column arranged at the other end of the compensation block; the slider has an inclined hole that cooperates with the inclined guide column.

[0015] The present invention provides a self-locking mechanism for an injection mold for large-area thin-walled composite inserts, wherein the driving structure includes a slider cover plate arranged at one end of the slider and a limit block arranged at one side of the slider; the slider cover plate is used to limit the up and down movement of the slider; the limit block is used to limit the left and right movement of the slider; the slider cover plate has a first avoidance groove for avoiding the inclined guide column.

[0016] The present invention provides a self-locking mechanism for an injection mold of a large-area thin-walled composite insert, wherein the driving structure includes a driving bevel block arranged at one end of the slider; the end of the driving bevel block pointing to the insert tightness control structure has a first bevel surface.

[0017] The present invention provides a self-locking mechanism for an injection mold for composite inserts of large-area thin-walled parts, wherein the insert tightness control structure includes a base block, a movable block arranged on the base block, a lining plate arranged in the movable block, and an elastic member arranged between the base block and the lining plate; the lower end of the driving taper needle is arranged in the movable block and fixed by the lining plate; the movable block has a second beveled surface that cooperates with the first beveled surface; the left and right movement of the driving beveled block is converted into the up and down movement of the driving taper needle via the movable block and the elastic member.

[0018] The present invention provides an injection mold self-locking mechanism for large-area thin-wall composite inserts, wherein the end of the driving bevel block has a second avoidance groove; the second avoidance groove avoids the driving taper needle when the driving bevel block moves left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0020] Figure 2 It is an explosion diagram of the present invention;

[0021] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0022] Figure 4 It is an enlarged schematic diagram of the internal structure of the pin body;

[0023] Figure 5 Schematic diagram of the fit between the insert mounting portion and the deformable end;

[0024] Figure 6 It is a three-dimensional schematic diagram of the pin body and sleeve assembly;

[0025] Figure 7 An exploded diagram of the sleeve body, the connecting strip, and the driving taper needle;

[0026] Figure 8 An exploded diagram of the insert tightness control structure;

[0027] Figure 9 This is a schematic diagram of the state of the present invention when the mold is opened;

[0028] Figure 10 It is a schematic diagram of the state of the present invention when the mold is closed. DETAILED DESCRIPTION

[0029] Before describing in detail any embodiment of the present invention, it should be understood that the present invention is not limited in its application to the construction and arrangement details of the components set forth in the following description or illustrated in the following figures. The present invention is capable of other embodiments and can be practiced or carried out in various ways. In addition, it should be understood that the words and terms used herein are for descriptive purposes and should not be considered restrictive. The use of "including" or "having" and their variations herein is intended to cover the items and their equivalents set forth below and additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and their variations are used broadly and cover direct mounting and indirect mounting, connection, support and coupling. In addition, "connected" and "coupled" are not limited to physical or mechanical connections or couplings.

[0030] Furthermore, on the first hand, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the above terms cannot be understood as limitations on the present invention; on the second hand, the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" cannot be understood as a limitation on the quantity.

[0031] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

[0032] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0033] See also Figure 1-9 The self-locking mechanism of an injection mold for a large-area, thin-walled composite insert shown in FIG. 1 includes an insert fixing pin 1, a driving structure 2 disposed on one side of the insert fixing pin 1, and an insert tension control structure 3 disposed on one end of the insert fixing pin 1 and driven by the driving structure 2.

[0034] The insert fixing pin 1 includes a pin body 11 and a sleeve assembly 12 disposed in the pin body 11; the pin body 11 includes an insert mounting portion 111 disposed at one end and used to place the insert, and the sleeve assembly 12 includes a deformable end 121 that cooperates with the insert mounting portion 111;

[0035] The drive structure 2 includes a J-shaped guide post 21 and a slider 22. The J-shaped guide post 21 and the slider 22 move relative to each other up and down as the mold opens or closes, and the slider 22 is driven by the J-shaped guide post 21 to move left and right. The insert tension control structure 3 includes a driving taper needle 31 that moves up and down within the sleeve assembly 12 due to the left and right movement of the slider 22.

[0036] During injection molding, the tapered needle 31 is driven to move upward and the deformable end 121 is deformed outward to increase the force acting on the insert; when placing the insert, the tapered needle 31 is driven to move downward and the deformable end 121 is reset inward to reduce the force acting on the insert.

[0037] In actual use, the insert fixing pin 1 of the present invention includes a pin body 11 and a sleeve assembly 12. The pin body 11 includes an insert mounting portion 111 for placing the insert and setting the insert in the mold cavity; the sleeve assembly 12 includes a deformable end 121, the driving structure 2 includes a J-shaped guide column 21 and a slider 22, and the insert tightness control structure 3 includes a driving tapered needle 31. When the mold is closed, the J-shaped guide column 21 drives the slider 22 and the driving tapered needle 31 to move, thereby driving the deformable end 121 to deform outward, so that the force between the deformable end 121 and the insert is increased, thereby reducing the movement of the insert under high pressure during injection molding, thereby The quality of the injection molded products is improved and the defective rate is reduced. When the mold is opened, the J-shaped guide column 21 drives the slider 22 and drives the tapered needle 31 to move, thereby driving the deformable end 121 to reset inward, so that the force between the deformable end 121 and the insert is reduced, thereby making it easy to demold the finished product and the success rate of placing the new insert on the insert mounting portion 111 is increased, thereby further improving the quality of the injection molded products and reducing the defective rate. In addition, due to the setting of the deformable end 121, the fitting clearance between the insert mounting portion 111 and the insert can be designed to be larger, so that the insert can be placed manually or by a robot when the mold is opened, further improving the success rate of insert placement.

[0038] Please continue reading Figure 3 、 Figure 5 、 Figure 6 , wherein the deformable end 121 includes at least one deformable piece 1211, and the insert mounting portion 111 includes at least one empty slot 1111 that cooperates with the deformable piece 1211; the driving tapered needle 31 includes a needle rod 311 and a needle head 312 arranged at the end of the needle rod 311; when the needle head 312 cooperates with the deformable piece 1211, the deformable piece 1211 is hidden in the insert mounting portion 111 through the empty slot 1111; when the needle rod 311 cooperates with the deformable piece 1211, the deformable piece 1211 protrudes from the insert mounting portion 111 through the empty slot 1111.

[0039] Specifically, the size of the needle head 312 is smaller than the needle rod 311, and the influence on the deformable piece 1211 gradually increases in the process of driving the tapered needle 31 to move upward; the deformable piece 1211 itself is elastic, and under the action of the needle head 312 or the needle rod 311, it will gradually deform along the slot 1111 until the needle rod 311 is in full contact with the deformable piece 1211. The deformation degree of the deformable piece 1211 reaches the maximum, and the force of the deformable piece 1211 on the insert also reaches the maximum. At this time, the entire injection mold is in a closed mold state, and the molten injection molding material is pressed into the mold cavity to prevent the insert from jumping under the huge injection pressure.

[0040] Furthermore, in this embodiment, the number of deformable sheets 1211 is set to four and is evenly distributed along the circumference of the driving tapered needle 31. The number of empty slots 1111 cooperating with the deformable sheets 1211 is also set to four, and the position distribution corresponds to the four deformable sheets 1211 respectively. Under this setting, for the insert, the four deformable sheets 1211 act evenly on the inner wall of the insert, so that the deformable sheet 1211 has a stronger ability to lock the insert, and the force on the insert is more even and balanced, which can avoid the problem of the insert shifting to one side under huge injection pressure. For the driving tapered needle 31, the design of the four deformable sheets 1211 evenly distributed along the circumference can avoid the reaction force of the deformable sheets 1211 on the outer wall of the needle rod 311 under huge injection pressure, causing the needle rod 311 itself or the assembly of the entire insert tightness control structure 3 to be deformed and loosened, thereby extending the service life of the needle rod 311 itself or the entire insert tightness control structure 3.

[0041] It is worth mentioning that when the mold is fully closed, the critical point of the needle 312 and the needle rod 311 contacts the deformable piece 1211, and the positions of the two correspond. Since the needle 312 is a tapered structure with a gradually changing diameter, and the diameter of the needle rod 311 is constant, the deformable piece 1211 gradually changes under the drive of the needle 312. When the needle rod 311 contacts the deformable piece 1211, the deformation degree of the deformable piece 1211 is the largest, and the needle rod 311 continues to move and cannot make the deformable piece 1211 deform. 1 continues to change, so under this position setting, the stroke of the needle head 312 and the needle rod 311 is the shortest, which is beneficial to reducing the length of the driving tapered needle 31 and improving the stability of the entire insert anti-jumping mechanism; moreover, when the mold is opened, the driving tapered needle 31 is immediately squeezed, and the needle head 312 immediately moves toward the deformable piece 1211, so that the deformation of the deformable piece 1211 is immediately reduced, thereby immediately reducing the force acting on the inside of the insert 6, preventing the inner wall of the insert 6 from being damaged when the insert mounting portion 111 is withdrawn.

[0042] Please continue reading Figure 5 , wherein a plurality of locking portions 12111 are provided on a side of the deformable piece 1211 facing the slot 1111 ; the locking portions 12111 are used to increase the force between the deformable end 121 and the insert.

[0043] In this embodiment, the locking portion 12111 is configured as a plurality of serrated structures, and are arranged in sequence from top to bottom on the side of the deformable piece 1211 facing the slot 1111; the inner wall of the insert is generally provided with a threaded structure to form a threaded hole. When the deformable piece 1211 and the inner wall of the insert are aligned, the aforementioned serrated structure can extend into the threaded structure of the inner wall of the insert, thereby forming a firm locking structure, greatly enhancing the force between the two and effectively reducing the axial movement of the insert.

[0044] It is understandable that the locking portion 12111 can also be set to other shapes, such as a threaded shape that matches the threaded structure of the inner wall of the insert, or a protruding structure that increases friction.

[0045] Please continue reading Figure 4 、 Figure 6 , wherein the interior of the pin body 11 has a first hole section 112, a second hole section 113 and a third hole section 114; the sleeve assembly 12 includes a sleeve body 122 and at least one connecting strip 123 nested by the sleeve body 122; the connecting strip 123 includes a limit block 1231 and a transition strip 1232; the limit block 1231 cooperates with the first hole section 112; the sleeve body 122 cooperates with the second hole section 113; the transition strip 1232 passes through the sleeve body 122 and cooperates with the third hole section 114; the deformable end 121 is arranged at the end of the transition strip 1232.

[0046] Specifically, the driving tapered needle 31 needs to move up and down in the insert fixing needle 1 to drive the tightness of the deformable sheet 1211. Therefore, it is necessary to ensure that the deformable sheet 1211 is not carried up and down during the up and down movement of the driving tapered needle 31. In this embodiment, the lower end surfaces of the needle body 11, the sleeve body 122 and the connecting strip 123 are arranged on the same plane, and the plane is supported by other structures of the injection mold, so that when the driving tapered needle 31 moves downward, the needle body 11, the sleeve body 122 and the connecting strip 123 will not be carried out downward. When the tapered needle 31 moves upward, the sleeve body 122 is limited by the upper end of the second hole section 113, so the sleeve body 122 will not be driven to move upward by the tapered needle 31, and the limit block 1231 is limited by the first hole section 112, so the first hole section 112 will not be driven to move upward by the tapered needle 31; since the limit block 1231 and the transition bar 1232 are limited during the up and down movement of the tapered needle 31 and will not move up and down accordingly, the deformable end 121 set at the end of the transition bar 1232 can stably complete the loose and tight fitting action with the insert.

[0047] Please continue reading Figure 6 、 Figure 7 , wherein the sleeve body 122 has an intermediate channel 1221 arranged inside, at least one first embedding groove 1222 arranged below the side wall, and at least one second embedding groove 1223 arranged above the side wall; the intermediate channel 1221 is used for the movement of the needle rod 311; the first embedding groove 1222 cooperates with the limit block 1231; the second embedding groove 1223 cooperates with the transition bar 1232.

[0048] Specifically, during the up and down movement of the driving tapered needle 31, it is necessary not only to ensure that the deformable end 121 does not move axially, but also to ensure that the deformable end 121 does not rotate. If the deformable end 121 rotates during the repeated movement of the driving tapered needle 31, after the rotation amount accumulates to a certain extent, the deformable piece 1211 and the empty groove 1111 may be misaligned, resulting in failure of the deformable piece 1211; therefore, the outer wall of the sleeve body 122 is set to have an interference fit with the second hole section 113, so that the sleeve body 122 does not rotate during the repeated movement of the driving tapered needle 31. On this basis, the first embedded groove 1222 is limited by the limit block 1231, and the second embedded groove 1223 is limited by the transition bar 1232, so that both cannot rotate. Finally, the deformable end 121 set at the end of the transition bar 1232 will not rotate during the repeated movement of the driving tapered needle 31, so that the loose and tight fit with the insert can be stably completed.

[0049] It can be understood that the aforementioned deformable ends 121 are set as four, which is a preferred embodiment. According to this embodiment, the connecting strip 123, the first embedding groove 1222 and the second embedding groove 1223 are all set as four to match the four deformable ends 121.

[0050] Please continue reading Figure 3 , wherein the J-shaped guide column 21 includes a compensation block 211, a connecting block 212 arranged at one end of the compensation block 211 and an inclined guide column 213 arranged at the other end of the compensation block 211; the slider 22 has an inclined hole 221 that cooperates with the inclined guide column 213.

[0051] It can be understood that the connecting block 212 is connected to the upper mold or the lower mold of the injection mold so as to follow the movement of the upper mold or the lower mold; the compensation block 211 is arranged between the connecting block 212 and the inclined guide column 213 and is biased to one side so as to provide a basis for the inclined setting of the inclined guide column 213; only with the cooperation of the inclined guide column 213 and the inclined hole 221 can the movement of the J-shaped guide column 21 be converted into the left and right movement of the slider 22.

[0052] Please continue to refer to the figure Figure 3 , wherein the driving structure 2 includes a slider cover 23 arranged at one end of the slider 22 and a limiting bumper 24 arranged on one side of the slider 22; the slider cover 23 is used to limit the up and down movement of the slider 22; the limiting bumper 24 is used to limit the left and right movement of the slider 22; the slider cover 23 has a first avoidance groove 231 for avoiding the oblique guide column 213.

[0053] Specifically, the slider cover 23 is connected to the injection mold. During the up and down movement of the J-shaped guide column 21, the slider cover 23 is fixed to limit the slider 22 so that the slider 22 will not be moved up and down by the J-shaped guide column 21; the first avoidance groove 231 of the slider cover 23 is used to provide space for the up and down movement of the J-shaped guide column 21; the limiting bumper 24 is connected to the injection mold. During the left and right movement of the slider 22, the limiting bumper 24 is used to limit the maximum movement stroke of the slider 22.

[0054] Please continue reading Figure 3 , wherein the driving structure 2 includes a driving bevel block 25 arranged at one end of the slider 22; the driving bevel block 25 has a first bevel surface 251 at one end pointing to the insert tightness control structure 3.

[0055] Specifically, the provision of the driving bevel block 25 is beneficial to increasing the control distance of the driving structure 2 so as to adjust the distance according to the overall layout of the injection mold, so that the present invention can stabilize the delivery effect without interfering with other mechanisms in the injection mold.

[0056] Please continue reading Figure 3 、 Figure 7 , wherein the insert tightness control structure 3 includes a base block 32, a movable block 33 arranged on the base block 32, a lining plate 34 arranged in the movable block 33, and an elastic member 35 arranged between the base block 32 and the lining plate 34; the lower end of the driving taper needle 31 is arranged in the movable block 33 and fixed by the lining plate 34; the movable block 33 has a second bevel surface 331 that cooperates with the first bevel surface 251; the left and right movement of the driving bevel block 25 is converted into the up and down movement of the driving taper needle 31 through the movable block 33 and the elastic member 35.

[0057] Specifically, the base block 32 is fixed on the injection mold, and the movable block 33 is located on the base block 32 and can move up and down under the action of the elastic member 35; when the driving bevel block 25 is moved to the left, the first bevel surface 251 and the second bevel surface 331 interact with each other to compress the elastic member 35 and make the movable block 33 move downward. At this time, the driving tapered needle 31 also moves downward under the fixation of the movable block 33 and the lining plate 34, and the deformable piece 1211 is hidden in the insert mounting portion 111, and the insert is easily placed on the insert mounting portion 111; when the driving bevel block 25 is moved to the right, the first bevel surface 251 and the second bevel surface 331 disengage from each other, causing the elastic member 35 to stretch and making the movable block 33 move upward. At this time, the driving tapered needle 31 also moves upward under the fixation of the movable block 33 and the lining plate 34, and the deformable piece 1211 protrudes from the insert mounting portion 111 and locks the insert, making it difficult for the insert to jump during injection molding.

[0058] Please continue reading Figure 3The end of the driving bevel block 25 has a second avoidance groove 252; the second avoidance groove 252 avoids the driving taper needle 31 when the driving bevel block 25 moves left and right.

[0059] It can be understood that since the lower end of the driving taper needle 31 is arranged in the movable block 33 and the upper end extends from the movable block 33, the setting of the second avoidance groove 252 makes it possible for the driving bevel block 25 to not interfere with the driving taper needle 31 during the cooperation between the first bevel surface 251 and the second bevel surface 331, thereby enabling the driving taper needle 31 to stably drive the movement of the deformable piece 1211.

[0060] The above description is merely a description of the preferred embodiment of the present invention and is not to be construed as limiting the scope of the claims. The present invention is not limited to the above embodiment, and variations in the specific structure are permitted. Any variations within the scope of the independent claims of the present invention are also within the scope of protection of the present invention.

Claims

1. A self-locking mechanism for injection molds used for large-area, thin-walled composite inserts, characterized by: It comprises an insert fixing pin (1), a driving structure (2) arranged on one side of the insert fixing pin (1), and an insert tightness control structure (3) arranged on one end of the insert fixing pin (1) and driven by the driving structure (2); The insert fixing pin (1) comprises a pin body (11) and a sleeve assembly (12) disposed in the pin body (11); the pin body (11) comprises an insert mounting portion (111) disposed at one end and used for placing the insert, and the sleeve assembly (12) comprises a deformable end (121) cooperating with the insert mounting portion (111); The driving structure (2) includes a J-shaped guide post (21) and a slider (22); the J-shaped guide post (21) and the slider (22) move up and down relative to each other as the mold is opened or closed, and the slider (22) is driven by the J-shaped guide post (21) to move left and right; the insert tightness control structure (3) includes a driving taper needle (31) that is driven by the left and right movement of the slider (22) to move up and down in the sleeve assembly (12); During injection molding, the driving tapered needle (31) moves upward, and the deformable end (121) deforms outward to increase the force acting on the insert; when the insert is placed, the driving tapered needle (31) moves downward, and the deformable end (121) resets inward to reduce the force acting on the insert; The deformable end (121) includes at least one deformable piece (1211), and the insert mounting portion (111) includes at least one empty slot (1111) that cooperates with the deformable piece (1211); the driving taper needle (31) includes a needle rod (311) and a needle head (312) arranged at the end of the needle rod (311); when the needle head (312) cooperates with the deformable piece (1211), the deformable piece (1211) is hidden in the insert mounting portion (111) through the empty slot (1111); when the needle rod (311) cooperates with the deformable piece (1211), the deformable piece (1211) protrudes out of the insert mounting portion (111) through the empty slot (1111).

2. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 1, characterized in that: A plurality of locking portions (12111) are provided on a side of the deformable piece (1211) facing the empty slot (1111); the locking portions (12111) are used to increase the acting force between the deformable end (121) and the insert.

3. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 1, characterized in that: The insert pin body (11) has a first hole section (112), a second hole section (113) and a third hole section (114) inside; the sleeve assembly (12) includes a sleeve body (122) and at least one connecting strip (123) nested in the sleeve body (122); the connecting strip (123) includes a limit block (1231) and a transition strip (1232); the limit block (1231) cooperates with the first hole section (112); the sleeve body (122) cooperates with the second hole section (113); the transition strip (1232) passes through the sleeve body (122) and cooperates with the third hole section (114); the deformable end (121) is arranged at the end of the transition strip (1232).

4. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 3, characterized in that: The sleeve body (122) has an intermediate channel (1221) arranged inside, at least one first embedding groove (1222) arranged below the side wall, and at least one second embedding groove (1223) arranged above the side wall; the intermediate channel (1221) is used for the movement of the needle rod (311); the first embedding groove (1222) cooperates with the limit block (1231); and the second embedding groove (1223) cooperates with the transition bar (1232).

5. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 1, characterized in that: The J-shaped guide column (21) comprises a compensation block (211), a connecting block (212) arranged at one end of the compensation block (211), and an inclined guide column (213) arranged at the other end of the compensation block (211); the slider (22) has an inclined hole (221) that cooperates with the inclined guide column (213).

6. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 5, characterized in that: The driving structure (2) comprises a slider cover (23) provided at one end of the slider (22) and a limiting bumper (24) provided at one side of the slider (22); the slider cover (23) is used to limit the up and down movement of the slider (22); the limiting bumper (24) is used to limit the left and right movement of the slider (22); and the slider cover (23) has a first avoidance groove (231) for avoiding the oblique guide column (213).

7. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 1, characterized in that: The driving structure (2) comprises a driving bevel block (25) arranged at one end of the slider (22); the end of the driving bevel block (25) pointing toward the insert tightness control structure (3) has a first bevel surface (251).

8. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 7, characterized in that: The insert tightness control structure (3) comprises a base block (32), a movable block (33) arranged on the base block (32), a lining plate (34) arranged in the movable block (33), and an elastic member (35) arranged between the base block (32) and the lining plate (34); the lower end of the driving taper needle (31) is arranged in the movable block (33) and fixed by the lining plate (34); the movable block (33) has a second bevel surface (331) matched with the first bevel surface (251); the left and right movement of the driving bevel block (25) is converted into the up and down movement of the driving taper needle (31) via the movable block (33) and the elastic member (35).

9. The self-locking mechanism for injection molds for large-area, thin-walled composite inserts according to claim 7, characterized in that: The end of the driving bevel block (25) has a second avoidance groove (252); the second avoidance groove (252) avoids the driving taper needle (31) when the driving bevel block (25) moves left and right.

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